【摘要】 应用二维三分量混合模拟方法数值研究了各向异性等离子体中的磁场重联过程.计算结果表明,当等离子体垂直于磁场方向的压强大于平行方向的压强时(P⊥/P∥=1.5),等离子体不稳定性的增长率会大大增强,重联速度也会加快;当等离子体垂直方向的压强小于平行方向的压强时(P⊥/P∥=0.6),会出现火蛇管不稳定性,将抑制撕裂模不稳定性和磁场重联过程.更多还原

【Abstract】 The process of magnetic reconnection in an anisotropic plasma is studied based on two and half dimensional hybrid simulation. The results agree with theories. It is found that the growth rate of instability is enhanced greatly and the speed of magnetic reconnection is increased in the presence of pressure anisotropy (P⊥/P∥ = 1.5) compared with that in pressure isotropy. In a pressure anisotropy (P⊥/P∥ = 0.6) fire hose instability appears, which will restrain the tearing mode instability and magnetic reconnection. Because of the fire hose instability and the restraint of the tearing mode, the width of magnetic island in a pressure anisotropy (P⊥/P∥ = 0.6) is narrower than that in pressure isotropy. In addition, compared with the results based on MHD simulation, the effect of pressure anisotropy in our hybrid simulation is less obvious, which may be caused by the different conditions used in different simulation modes.更多还原